The Fallacy of Mob Appeal

This is an attempt to persuade people (usually a large group of people) by using powerful feelings, rather than logic. For example an evolutionist may say “I say we don’t need God to know right from wrong. You have every right to follow your own standard! Don’t let others tell you what to do. It is your right to think for yourself!”. This is logically absurd and self-refuting. How could we possibly obey the instruction to not let others tell us what to do?